Telegraph system.



's. 11. FIELD. TELEGRAPH SYSTEM. APPLICATION FILED DEC. 1. 1906.

Patented N0v.2 1, 1908.

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STEPHEN D. FIELD, OF STOOKBRIDGE, MASSACHUSETTS.

TELEGRAPH SYSTEM.

Specification of Letters Patent.

Patented Nov. 24:, 1908.

Application flied December 1, 1906. Serial No..3&5,866.

To (625 whom izfimay concern:

h ll. known that I, STEPHEN D. FIELD, a

achusetts, have invented con sei'ul inu'irovonuints in -L' 1 1:

or much chi, ioliorving 1s a I exact. description.

ention relates to a method of 21c .01 shar suing the signals in .ariiicularly adaptable to long tclc: graph i /here the signals are ordinarily retarded or .gggisii h the line inductance and capacic m in the drawn. Figure 1 is a diagramznai'ic View shou 411p an arrangement of circuits at a single station of a. telegraph line, and cinbimying the principles of my invention; Fig. 2 is a-view of the same in more cliagrzunn'latic form; Fig. 3 shows a slight modification.

in carrying out my invention I make use magnetism in an iron body which is utilii to generate an elcctroniotive force both the iception and at the completion of the '1 ls. These inomenhiry herein more abrupt, and thereby sharpen or "elcrate the signals. in the present application 1 have shown the ordinary relays wound so that the iron of their construction will he magnetized to operate in the above 6" Referring to Fig. 1, 1 is a telegraph relay, ind 3 is an ordinary ransmitting key. -5

Quotes the armature of the relay moving .Q-UVGQH stops 4 and 5, and normally tensioned against the back stop by the spring 6, adjusted by the thumb Wheel 7. The magnet 8 of the relay 1 has cores 9 and 10, of which 9 is Wound with a few turns of wire 11 in the line circuit, while 10 has a considerably larger number of turns in circuit with a. condenser 13, and bridged across the key 9.. 14 denotes a circuit closing switch having an arm n which completes this bridging circuit through a connection a when in the full line position shown in Fi L and L are the line connections. 2 exactly like Fig. 1, except the representation is in purely diagrammatic "form. A detailed description of this figure therefore unnecessary. The construction of is also like that of Fig. 1, except the winding 12 is bridged. across both clectroinotive are applied to make the current changes the Winding 11 and the key 2, instead of the key 2 alone as in the pre eding form.

The method of operation is as follows: hen the key 52 is closed, current flows throw ii 1' 11, and energizes tho core to cause it to attract the arm-.2- lxure. When the key 2 is o sued, the current no longer has this path, *ut is obliged to traverse the Winding 12 through the condenser, in which path it is subjected to the counter E. M. F. clue to the dying out mag; netisni of the core 9. This counter E. M. 1 of coil 11, of course, greatly prepondcrates over the direct E. M. F. of tho'winding 12 on account of the larger number turns there in. This line current is there arrested promptly as is desired. The condenser 13 acts in the manner of all condensers, permitting, for a momentary interval, a current flow thercthrough exactly as if it were not in the circuit. \Vhen the key 2 is closed, the reverse effect takes place since current now passes through the Winding 12, (due to the condenser discharge). This current assists inthe prompt. magnetization of the core 9, and thereby the How of curren in the line. The signals in the line are therefore accelerated and sluggishness overcome, since the abr :plncss of the current variations is increase-Ll both at tho hoginniu and at the end thereof.

What i claim, is:-

1. The method of accelerating the transmission oi telegraphic signals which. consists in impressing upon the line. an electronictivo force which is counter to the line current, at the instants When the circuit. is opened to form the signals.

2. The method of accelerating the transmission of telegraphic signals which consists in impressing upon the line at the inslants of closing the circuit in 1 formation of signals a momentary extra electromotive force in a direction to augment the line current.

3. The method of accelerating the in" mission oi telegraphic signals which consists in impressing upon the line at. the instants of the opening; of the circuit in the.

line between signals to accumulate a store of energy tthe transmitting station, and utilizing said energy when the key of such station is closed to impress an electromotive force in the direction of the line current In itness whereof, I subscribe my slgnature, in the presence of two Witnesses.

' STEPHEN D. FIELD.

Witnesses:

F. F. Conmss, PETER D. GILCHRIST. 

